Knob cover



FIG. 1 is a front perspective view of the knob cover;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a back view thereof; and,

FIG. 7 is a side view thereof, with the left and right side views being mirror images. 

CLAIM The ornamental design for a knob cover, as shown and described. 